Spark-plug.



C. A. MEZGER.

,SPARK PLUG.

APPLICATION FILED SEPT.20, I9l2.

CHARLES A. MEZGER, or NEW YORK, N. Y.

SPARK-PLUG.

specification of Letters Patent.

Application led September 20, 1912. Seria1No- 721,491.

To alla-hom, it lmay concern:

Be it known that I', CHARLES A. MEZGER, a citizen of the United States, and a resident'of the city ofL New York, borough of Brooklyn, county of'Kings, and State of New York, have invented a new and useful Improvement in Spark-Plugs, of which the following is a full, clearand exact'description. i

My invention relates to a packing for making a pressure tight joint between the porcelain or Ainsulation and the body or shell of the spark plug' or jump spark igniter `'used in gasolene and other internal combustion engines.

' The accompanying drawings show the preferred, practical embodiment of theinvention.

In these drawings-Figure 1l isa longitudinal section of the plug fitted with my improvement and F i g. 2 is an enlarged section of the cup and gasket.

In F ig. 1, a is the body of the plug which inclos' 1 the porcelain, 2),' the two respectively having opposing shoulders al and 61 between which the packing is located and adapted to be effective.

The packing comprises a gasket, c, of asbestos or otherfibrous substa'nce, `and a ring, d, the two lying against each other and respectively engaging the shoulder b1 of the porcelain and the shoulder al of the body. The ring l has an abutting surface toengage tl'ieshoulder al, and from the upper or -outer side of the .ring a thin skirt d1 extends along` the surface of the porcelain for the purpose of being received friction-tight within the gland le, thereby fastening the parts o, c, d, and' e together and allowing them to be withdrawn as a unit from the body a.

The parts c, l and LZ1 are circular in forml and when the gland is screwed home in the body, the skirt l1 is wedgc'dor driven between the gland, and the porcelain, and the gasket c is frowded tightly between the ring d and shoulder b1. This makes an air or {luid-pressure tigllt joint between the ring and porcelain, while the abutting surface of the ring engaging the corresponding shoulder a1 of the body ymakes a. tight joint at that point. l

This yinvention allows the use of a solid gasket cut from an integral piece of asbestos and the solid ring d `furnishes a suliicient metal mass to engage, without injury, the iron body a and withstand the crushing or crumpling effect of such engagement. The ring cl and its skirt Z1 are preferably formed of an integral mass of brass or'other relatively soft metal, though they may be made'up of more than one piece. Further, the parts d and Z1 are preferably of dierent thickness, as shown, though this is not absolutely necessary.

Having thus described my invention, what I claim is: j f

1. A spark plug comprising the'combination' with the body, porcelain and gland of a -ibrous gasket to engage the porcelain, and a rigid metal ring engaging the gasket and the body and a thin skirt of metal extending from the ring upward between the outer `peripheral surface of the porcelain and inner surface' of the gland and pinched therebetween, whereby the gland, porcelain and ring may be removed together without disturbing their relative positions.

2. A spark plug comprising the combination with the body, porcelain and gland, of a fibrous gasket engaging a shoulder on the porcelain, a metal ring or annulus engaging the gasket and a shoulder on the body, sai shoulders opposing each other, and a thin metal skirt extending from the ring upward between the outer peripheral surface of the porcelain and inner surface of the gland and pinched therebetween, whereby the gland, porcelain and ring may be removed together without disturbing their relativev positions.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses this 31st day of August, 1912. y

CHARLES A. MEZGER.

Witnesses:

KATE ROSEN BERG, Isaac l. OWENS.

Patented Apr. 6 1915.

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